Luft licence agreement
18 August 2026
This document governs the use of the Luft desktop application (“the Software”) between its owner, Alberto Quintin Navarro (“the Owner”), and the person installing or using it (“the User”). By installing or using the Software you accept these terms; if you do not agree, do not install it.
1. Grant of licence
The Owner grants you a free, non-exclusive, non-transferable and revocable licence to install and use the Software on as many devices you own or control as you wish, for any lawful purpose, personal or professional.
2. Restrictions
Except to the extent expressly permitted by applicable law, you may not: (a) redistribute, sell, rent, sublicense or make the Software or its components available to third parties; (b) decompile, disassemble or reverse-engineer the Software, other than for the interoperability allowed by law; (c) remove or alter authorship, trade mark or licence notices; (d) use the name “Luft” or its logo so as to imply a relationship with, or sponsorship or endorsement by, the Owner. Linking to this site so that others can download Luft is allowed and appreciated.
3. Ownership
The Software is the property of the Owner and is protected by intellectual property law. This licence transfers no ownership rights to you. The open-source components included in the Software are governed by their own licences, listed in the “About” dialog and in the installation folder.
4. Your data and your files
The Software runs on your device. The files you import or create with it (.luftdb databases, PGN, repertoires, annotations) are yours and are not sent to any server. The only network connection the Software makes is the optional new-version check described in the privacy policy. Any UCI chess engines you install or configure are third-party software with their own licences; the Software does not distribute them.
5. Games database
The games database downloadable from this site is made of games from the Lichess open database (CC0 1.0) and from collections published under an open licence or in the public domain. You may use it freely; if you redistribute it, credit the sources.
6. Updates
The Owner may publish updates that the Software offers to install. Updates are subject to this licence unless accompanied by a new version of it, which will be shown to you before installation.
7. Disclaimer of warranties
The Software is provided free of charge “as is” and “as available”, without warranty of any kind, express or implied, including warranties of merchantability, fitness for a particular purpose and absence of errors. The Owner does not warrant that the Software will run without interruption or that all defects will be corrected. Nothing in this clause limits rights that mandatory consumer law grants you.
8. Limitation of liability
To the maximum extent permitted by law, the Owner shall not be liable for indirect damages, loss of profit, loss of data or games, or any damage arising from the use or inability to use the Software, and the Owner’s total liability shall not exceed the amount you paid for the Software (zero, as it is free). This limitation does not apply to damage caused by wilful misconduct or gross negligence, nor to personal injury.
9. Term and termination
This licence lasts as long as you use the Software and terminates automatically if you breach its terms, in which case you must uninstall it. You may terminate it at any time by uninstalling the Software.
10. Governing law
This licence is governed by Spanish law. Any dispute shall be submitted to the courts of the Owner’s domicile, unless the User is a consumer, in which case the courts of the User’s own domicile are also available. Should the Spanish and English versions differ, the Spanish version prevails.